Keyphrases
- query answering
- databases
- data integration
- ontology based data access
- data exchange
- inconsistent databases
- conjunctive queries
- integrity constraints
- data integration systems
- data complexity
- incomplete information
- data sources
- answering queries
- data management
- database
- query rewriting
- data model
- query answers
- knowledge representation
- knowledge base
- inclusion dependencies
- global schema
- dl lite
- semantic annotation
- domain ontology
- semantic web
- database systems
- query relaxation
- xml data exchange
- data sets
- domain knowledge
- relational databases
- natural language
- query containment
- datalog programs
- regular path queries
- conceptual modeling
- schema mappings
- error bounds
- complexity of query answering
- decision making